Imac Intel freezin  & crashing since installing lion

My late 2009 24" iMac has been freezin and crashing since installing lion. Sometimes red dots appear on the display and sometimes the image breaks up and then freezes. Happens in Safari, Photoshop, Word and other programs. Is it a NVIDIA driver issue? Is there a fix?

I don't know if this helps, but OS X Lion has to re-index all of the files (correct me if I'm wrong), therefore, if you have just installed OS X Lion, you need to give it some time untill it has indexed all the files again (which could take a while if you have loads of files), after this it should return to normal.
Otherwise, a clean install?
Tim

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    Message was edited by: sdevan

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